linux-kernel - Re: [patch v2 21/30] x86/cpu/topology: Use topology bitmaps for sizing

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Date: Mon, 12 Feb 2024 17:40:52 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: "Zhang, Rui" <rui.zhang@...el.com>, "linux-kernel@...r.kernel.org"
 <linux-kernel@...r.kernel.org>
Cc: "Raj, Ashok" <ashok.raj@...el.com>, "mhklinux@...look.com"
 <mhklinux@...look.com>, "arjan@...ux.intel.com" <arjan@...ux.intel.com>,
 "ray.huang@....com" <ray.huang@....com>, "thomas.lendacky@....com"
 <thomas.lendacky@....com>, "andrew.cooper3@...rix.com"
 <andrew.cooper3@...rix.com>, "Sivanich, Dimitri"
 <dimitri.sivanich@....com>, "Tang, Feng" <feng.tang@...el.com>,
 "kan.liang@...ux.intel.com" <kan.liang@...ux.intel.com>, "Mehta, Sohil"
 <sohil.mehta@...el.com>, "peterz@...radead.org" <peterz@...radead.org>,
 "paulmck@...nel.org" <paulmck@...nel.org>, "kprateek.nayak@....com"
 <kprateek.nayak@....com>, "jgross@...e.com" <jgross@...e.com>,
 "andy@...radead.org" <andy@...radead.org>, "x86@...nel.org"
 <x86@...nel.org>
Subject: Re: [patch v2 21/30] x86/cpu/topology: Use topology bitmaps for sizing

On Fri, Jan 26 2024 at 21:22, Thomas Gleixner wrote:
> On Fri, Jan 26 2024 at 07:07, Zhang, Rui wrote:
>> Say, on my Adlerlake platform, which has 4 Pcores with HT + 8 Ecores,
>> cnta is 12, cntb is 16, and smp_num_siblings is set to 1 erroneously.
>>
>> I think we should use
>> 	smp_num_siblings = DIV_ROUND_UP(cntb, cnta);
>> here.
>
> Indeed. That's more than obvious.

I pushed out a new version which addresses this and also the fallout
Michael and Sohil reported:

  git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git topo-full-v3

I let the robot chew on it before posting it in the next days.

Thanks,

        tglx